I know I'm going to get ripped apart here but I went and spent 2hours trying on helmets without looking at prices and the one I picked shocked me. It fits perfect, (unlike many top brands)I got a tinted visor for 20 quid, the buckle is the best I've ever had on a helmet and it comes with a helmet bag as standard. It also has all the usual safety marks and isn't particularly heavy. Apart from the name I can't find a bad thing with it and I'm no snob so not really bothered.
Its a box scope which i got for 50 quid.
Like this one:
http://pages.ebay.com/link/?nav=item.view&id=270582710017Before you call me a tight bastard I had a budget of 300 but chose the one that fit me the best .... now form an orderly queue to take the Piss.